Not sure if this counts. Fullmetal Alchemist (The original anime) was the thing that got me in to anime. But I stopped watching it after a certain character died and it took me half a year until I continued and watched every episode that was left. Straight after that I watched through every Fullmetal Alchemist Brotherhood episode pretty quickly compared to the first anime.

chobits
jing: king of bandits
Chibi devi (actually gd but made more episodes and i dint feel like watch anymore)
Antique Bakery
Hetalia(srry Hetalia fans)
Demon king daimo
Kaiden Resteraunt
Big wind-up
XXXHolic
Hayate no Gotuku(actually into it for a while)
Kis &Sis
Miracle Train(did not feel like finihing)
Mawaru Penguin Drop
Ben-to
Yura-Yuri
Bleach(i had to cuz of the girl onhime and the school scenes/episodes was nott up for that)
Black jACK(SOOO DAMN BORING)
cashern
Kenichi
samurai Champloo

I can understand all of them except Samurai Champloo. How come? I'd like to know your reason. :]

Just curious because you are the first person I ever saw that dropped it.

Sword Art Online - The first 7 or so episodes were phenomenal and like nothing else I've seen (that I can think of) after that it suddenly became a completely different show, not necessarily bad but not what I wanted out of it after having watched the first episodes.

Fairy Tail - I really enjoyed the first few episodes but soon it started to feel the same as other shows in the genre and I just forgot to watch it :/

Demonbane
Magi
Vividred Operation
Horozon in the Middle of Nowhere
The Tower of Druaga
Occult Academy

I enjoyed Occult Academy, it was quite slow paced at first so I can see why you might have dropped it but around episode 11 it takes a massive twist which I never saw coming and became one of my more memorable shows.

Stuff like Azumanga Daioh and Lucky Star bore me easily. If there's no plot or event in the anime I eventually drift off from it and then realize I am in the third season of another anime lol. Even after 2 years I haven't finished either. I'll probably come back to it eventually.

In the middle of this post a random flying bug appeared in my room. I initiated Killer Karate mode and continued to throw random karate chops. I now cannot find the body. No sleep for me tonight

Reborn!
I slogged through the first 6 episodes. Such a slow beginning to the anime and it turned me off entirely. Unfortunately I've heard good things about it but will probably never watch the series again.

Sword Art Online, the first two episodes were promising, the next 6 episodes were filler, they time skipped two years ahead by episode 8, the Yui plot line was dull and even kind of creepy, the next two episodes were rushed and anticlimactic, and the first 3 episodes of the Alfheim storyline was where i finally said enough was enough